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Folprp4 Gene Involved in the Conidiogenesis and Mycelial Growth in Fusarium oxysporum f. sp. lini |
DONG Hui-xia,HOU Zhan-ming*() |
College of Life Science and Technology, Inner Mongolia Normal University, Key Laboratory of Biodiversity Conservation and Sustainable Utilization, Advanced Universities of Inner Mongolia, Hohhot 010022, China |
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Abstract Objective: To identify the Folprp4 gene in Fusarium oxysporum f. sp. lini and reveal its function and pathogenic correlation in Fusarium oxysporum f. sp. lini. Methods: Based on the principle of homologous recombination, the Split-Marker strategy was applied to construct the gene deletion cassette containing hygromycin resistance gene (hph) according to the genomic sequence of Folprp4 gene determined. The constructs were transformed into wild-type protoplasts mediated by PEG and the transformants were screened on TCC medium containing hygromycin B. The Folprp4 gene deletion mutants were confirmed by PCR with positive and negative primers. To do a complement test, the vector pZDH1 containing Folprp4 gene was constructed, and transformed into the deletion mutants. Results: Compared with wild type (hm) and ectopic insertion mutant (ecFolprp4), the growth of the mycelia of the deletion mutants was seriously obstructed and its colony looked like a tiny dot when the wild type and ectopic insertion mutant extended full of the plate. Another striking change of the deletion mutant was that the conidial production of ΔFolprp4 were significantly decreased. The infection assay showed that the virulence of ΔFolprp4 on flax seedlings was significantly reduced. The complement test indicated that the transformants of the complementary vector (Folprp4-C) recovered in colony morphology, growth rate, conidial yield and virulence of wild-type strain. Conclusion: The results revealed that Folprp4 gene was tightly associated with mycelial growth, conidial formation and pathogenicity in Fusarium oxysporum f. sp. lini.
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Received: 14 October 2021
Published: 07 April 2022
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Corresponding Authors:
Zhan-ming HOU
E-mail: houzhm@imnu.edu.cn
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